You should be straight with him.
彼に隠し事をすべきではない
You should bring an umbrella with you.
傘を持っていきなさい
You should do it immediately.
それをすぐになさってください(◆had betterより弱く丁寧)
You should feel mean for being so stingy.
そんなにけちけちして恥ずかしくないか
You should find somewhere to live.
どこか住む場所を見つけた方がいい
You should get your room straight.
部屋を整頓しないと
You should have been able to read the text over before the lecture.
講義の前にテキストをしっかり読んでおくことができたはずだ
You should have seen her face.
彼女の顔を見せたかったね
You should have someone check that out.
人に確認してもらうべきだ
You should never try to conceal the real you.
ほんとうのあなたを隠そうとしてはいけません